Deburring machine



Oct. 18, 1955 KRQGER 2,720,730

DEBURRING MACHINE Filed NOV. 7, 1952 4 eets-Sheet l INVENTOR.

ATTORNEYS.

Oct. 18, 1955 .G. H. KROGER 2,720,730

DEBURRING MACHINE 4 Sheets-Sheet 2 Filed Nov. 7, 1952 g Q g Q 3;

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w l\ w m 8 J J T T g "D g I g I I J i Q Q \9 o v \Q 3 Q INVENTOR.

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ATTORNEYS.

Oct. 18, 1955 G. H. KROGER DEBURRING MACHINE 4 Sheets-$heet 5 Filed Nov,7, 1952 INVENTOR.

ATTORNEYS.

Oct. 18, 1955 G. H. KROGER 2,720,730

DEBURRING MACHINE Filed Nov. 7, 1952 4 eet 4 4 4 C JNVENTOR.

A TTORNEYS.

United States Patent DEBURRING MACHINE George H. Kroger, South Bend,Ind, assignor, by mesne assignments, to Shrdebalrer-Packard Corporation,a cerporation of Application November 7, 1952, Serial N 0. 312201 11Claims. (Cl. 51--7) The present invention relates to deburring machinesand, particularly, to machines for deburring or finishing the blades ofa jet engine compressor rotor.

In forming various articles of manufacture, it frequently is necessarythat the articles be deburred to eliminate sharp edges or projectionsthat could be a source of injury. Also, articles of manufacture that aremachined to very high degrees of accuracy usually require deburring orrounding of sharp corners or the like, resulting from the machining, toeliminate a source of danger and/or to finish the article. For example,the blades of the rotor for a jet engine compressor must be machined toa very high degree of accuracy and thereafter it is necessary to roundoff or finish the blade edges. Heretofore, the deburring, finishing, orrounding has been done manually by skilled workmen equipped withportable electric grinders. The grinding must be done skillfully andaccurately despite the tedious nature of the work. Due to the variousfactors involved, finish grinding is extremely time consuming. Forexample, one jet engine rotor with which I am acquainted requiresapproximately 32 man hours of grinding to finish the blades thereof.

It is an object of the present invention to provide a machine forautomatically deburring, rounding or finishing articles of manufacture,whereby production is speeded up, substantial economies are attained inman hours expended, and more uniform finishing is obtained.

According to the present invention, I provide a machine comprising,basically, means for retaining a volume of abrasive material, and meansfor rotating or otherwise moving the article to be finished through thematerial. In the embodiment of my invention described in detailhereinafter, I provide a frame for supporting an open top box adaptedfor the reception of abrasive material and for rotatively supporting ajet engine rotor in such manner that the rotor blades extend into thematerial in the box, and a suitable drive for rotating the rotor. As therotor is rotated, the blades thereof pass through the material in thebox and the sharp edges thereof, resulting from accurate machining, areautomatically rounded or finished. I have found that the machine of myinvention will finish the blades of the said one rotor referred tohereinbefore in approximately one half hour, as compared with the 32 manhours previously required.

It is also an object of the present invention to provide means forpreventing an accumulation of abrasive material in any one portion ofthe box or container therefor, whereby uniform finishing of the articleis assured.

In accordance with the foregoing, one object of the invention is toprovide a deburring or finishing machine wherein the article to befinished is supported substantially on a horizontal axis and the box orcontainer of abrasive material is supported at an inclination to thehorizontal, and a second object of the invention is to provide means forreciprocating the box of abrasive material along a straight line at saidinclination transversely of the axis of the article.

A further object of the invention is the provision of a deburring orfinishing machine wherein the article to be finished is moved first inone direction and then in the opposite direction to insure complete anduniform finishing of the article. For example, with a jet engine rotor,the rotor is rotated in one direction for a predetermined period of timeand then is rotated in the opposite direction for an equal period oftime, while the box of abrasive material is continuously reciprocated.

A still further object of the invention is the provision of a deburringor finishing machine that is economical of manufacture and assembly andthat is sturdy and adapted for continued rugged service.

Other objects and advantages of the present invention will becomeapparent in the following detailed description of a preferred embodimentof the invention, wherein reference is made to the accompanyingdrawings, in which:

Figure 1 is a side elevation of the deburring machine of the invention;

Figure 2 is a fragmentary side view, on an enlarged scale, partly insection and partly in elevation, of the deburring machine;

Figure 3 is a fragmentary vertical cross section, on a further enlargedscale, the view being taken substantially on line 3-3 of Figure 2;

Figure 4 is an elevational view of the rotor drive train; and

Figure 5 is a horizontal view, partly in section and partly in plan, ofthe rotor drive train, the portions of the view in section being takensubstantially on the line 5-5 of Figure 4.

Referring now to the drawings, the deburring machine of the presentinvention includes a frame, indicated generally at 10, consisting of aplurality of frame members each formed of pipe and suitably securedtogether, as by welding. In particular, the frame 10 includes aplurality of upper longitudinal frame members 12 with three of themembers 12 being disposed at each side of the frame, lower longitudinalframe members 14 at each side of the frame which, at one end, extendbeyond the ends of the upper longitudinal frame members 12, verticalframe members 16 extending between the outer upper longitudinal framemembers 12 and the lower longitudinal frame members 14, a plurality oftransverse tie and bracing members 18 extending between the upperlongitudinal frame members 12 at each end and between the lowerlongitudinal frame members 14 at each vertical frame member 16, and aplurality of bracing studs 20 connected between the extending portion ofthe lower longitudinal frame members 14 and the top transverse tie 18 atthat end of the frame. The frame consisting of the members 12, 14, 16,18 and 20 is supported at an inclination to the horizontal by means of aplurality of legs 22 of increasing length from one end of the machine tothe other, that is from the left hand to the right hand end of themachine, as the same is shown in Figure 1. Hereinafter, the end of theframe supported by the shortest legs 22, which is also the end of themachine including the extending portions of the lower longitudinal framemembers 14, will be referred to as the drive end of the machine. Theopposite sides of the frame 10 are preferably closed by means of sideplates 24 closing the rectangular spaces between adjacent vertical framemernbers 16 and the upper and lower longitudinal frame members 12 and14, each of the side plates 24 being provided with a removable section26 for accommodating access to the interior of the machine when desired.

At each side of the frame 10, and approximately at the mid point of theupper longitudinal frame members 12, a plate 28 is secured to the top ofthe three longitudinal frame members 12. Each of the plates 28 isadapted for the support of a bearing bracket 30 suitably secured, as bywelding, to the respective plate 28. As will be appreciated, the plates28 are generally in alignment with one another transversely of the frameand the bearing brackets 30 are so mounted thereon that the bearingbrackets are in alignment with one another transversely of the frame;Each of the bearing brackets 30 comprises a fixed lower portion 32 and aremoval top section 3.4 pivoted to the lower portion 32; so that thebearing brackets are adapted L be openedto receiye bearings 36adaptedfor the rotatable support of the axle of an article ofmanufacture to be deburred or shed A h n n F ures. 1 to li e m sh n of te pre n invention is particularly adapted for working a rotor 37 o iet ie mpress the rotor 3 nsl ns a st b shaft 38 at each end thereof definingan axle for the rotor, a p u a of blade rin s 40 aip u l ty f pac rin 2'p e e eenadiace it blade v n and l tudinal tie bolts 44 for securing therings 48 and 42 tose The st ha ts-.38 a e ca rie a e c e f the rotor onthe respective end rings of the rotor assembly. As will be appreciated,the blade rings 49 each consist of a blade carrier'and'a plurality ofradially outwardly extending blades carried thereby. When assembled, thespacers 42 and blade carriers 40 define a tapered or conical baseportion from which the blades extend radially outward. As shown, theblades progressively increase in length from the large to the small endsof the tapered base portion of the rotor. At the larger end of therotor, the stub shaft 38 is tubular and is tion in a jet engineassembly. v

In use of the machine of the present invention, rotors coming ofi of theassembly line are moved to the masplit bearings may be provided, or theshaft, or hearing engaging portions of the brackets 30 may beaccurately. 'machined so as to receive the stub shafts 38 of the rotor37 directlyfrather than utilizing separate bearings 36 slipped on theshafts of the rotor before the same is.

lowered into the bearing brackets of the .deburring machine.Accordingly, the brackets 30 will be referred to hereinafter as splitsupports fOI journaling the axle 38 of the rotor or article ofmanufacture to be debu'rred or finished by the machine of the presentinvention; As

will be appreciated, the supports 30 are disposed at op-' posite sidesof the machine and. are aligned transversely of the machine so as tosupport the rotor in such 'position that the axis or axle thereof isdisposed substantially horizontally and extends transversely of theframe 10.

One of the mounting'plates 2 8, namely, the one adjacent the largediameter end of the rotor, is of substantial 7 size and iength so as toprovide a platform for mounting a rotor drive train, indicated generallyat 48. The drive a train 48 is adapted to drive or. move the rotor orOther.

article of manufacture journaled in the supports 30 and includes areversible electric motor 50 connected through a speed reducer 52 to adrive pinion 54. The pinion 54 meshes with a gear 56 mounted on one endof a shaft 58 which is journaled in a frame 66 mounted on the platform28 At the other end thereof, the shaft 58 carries a pinion 62 meshingwith a gear 64 mounted on a shaft 66 which is also journaled in theframe 60. ,The shaft 66, at the opposite end thereof, carries. a pinion68 meshing with a gear 70 mounted on a shaft 72 journaled in a secondframe 74, which frame is also'securecl to the platform 28 in alignmentwith the frame 60. The shaft 72 carries a pinion 76 meshing with anintermediate gear splined onthe inner wall thereof for operativeassocia- 78 mounted on a shaft 80 which is journaled in the frame 74.The intermediate gear 78 also meshes with a gear 82 including a hollowshaft 84, which shaft is journaled in the frame 74. That portion of thedrive train consisting of the pinion 54 and the various components 56 to84 is preferably disposed within a housing or enclosure 86. As will beappreciated, the arrangement of the various gears and pinions is such asto provide a substantial speed reduction between the speed reducer 52and the last gear 82 of the drive train.

A shaft 88, adapted to be driven by the drive train 48, is rotatably andslidably mounted in the hollow shaft 84 of the gear 82, the shaft 88being disposed in alignment with the supports 30 and being preferably ofsub- .stantial length so that the drive train 48 may be spaced from theadjacent support 30 to accommodate reception inrthe machine of rotorshafts of various lengths. At the end thereof adjacent the support 30,the'shaft 88 includes means for establishing operative driving con-vnection with an article of manufacture journaled in the supports 30 Inthe particular case, the shaft 88 carries a splined head 90 adapted tobe inserted in the hollow'stub shaft38 of the rotor to establishoperative driving connection between the. shaft 88 and the rotor 37. Thesplined' head 90 is suitably secured to the shaft 88 by means of a setscrew 92, orsuitable like means. The shaft 88 projects through thehollow shaft 84 and to the opposite side of the frame 74 carries acollar 94 suitably keyed or otherwise secured thereto. To this side ofthe frame, the hollow shaft 84 is provided with a radially r outwardlyextending flange 96 having a plurality of annularly disposed holestherein adapted for the reception of a pin 98 carried by the collar 94,whereby the collar and thusly, the shaft 88 may be clutched to orunclutche d' from the hollow shaft 84 of the last gear 82 in the drivetrain 48. To provide means for locking the shaft 88 in clutchedengagement with the shaft 84, the radial flange 96 of the shaft 84 isprovided with a circumferential groove 100 adapted for the reception ofthe finger portions of a plurality of clutch levers 102 pivoted to" thecollar 94 of the shaft 88 and biased by spring means 104 to retain thefinger portions thereof within the circum fe'rential groove 10.0 in theflange 96 of the shaft 84.

As will be appreciated the clutch mechanism may be modified in variousknown manners. For example, the pin may be provided on the radial flange96 of the shaft 84 and the holes may be provided in the collar 94 of theshaft 88,01 a resilient sleeve may be suitably pinned to the collar 94or the radial flange 96 and carry a pin adapted to be received withinholes-provided in the flange 96 or collar 94, respectively, to providefor limited torsional elasticity in the clutch mechanism. 'Othermodified clutch mechanisms will readily suggest themselves to thoseskilled in the art. 'In use of the machine, unclutch ing of the collar94 from the flange 96 will result in retraction of the shaft 88 toeffect a separation or unclutching of the splined head 90 of the shaft88 and the stub shaft 38 of the rotor 37. Sincethe motor 50 of the drivetrain 48 is reversible, it will be appreciated that the drive train 48is adapted to rotate the rotor 37 slowly in either direction, as will bedescribed in detail here inafter.

Within the frame 10, longitudinal guides or guide means 106 are providedat each side of themachine;

Each guide preferably comprises a pair of spaced parallelangle irons'108secured to the vertical frame members 16. The angle irons 108 areadapted for the 'reception therebetween of rollers 110 mounted on shafts112 which shafts are mounted in bracing members 114 suitably 'se-- curedto the sides of a wooden box-like frame or subframe 116, whereby thesub-frame 116 is supported by the longitudinal guides 106 for movementlongitudinally of the frame 10. As will be appreciated, movement of thesub-frame 116 longitudinally of the frame 10 will be effectedtransversely of the axis of the article of manu facture journaled in thesupports 30. To provide for accurate positioning of the rollers 110within the guide means 106, a bearing plate 118 or the like ispreferably secured to the guide surface of the upper angle iron 108. Forsupporting the sub-frame 116 against side thrust, a plurality ofhorizontally disposed rollers 120 are mounted on the lower angle iron108 and bear against the sides of the bracing members 114. The rollers120 are so spaced as to accommodate a predetermined reciprocation of therollers 110 and sub-frame 116 longitudinally of the frame 10.

The sub-frame 116 provides means for mounting a metallic container orbox 122 adapted for the reception of abrasive material. As will beappreciated as the description proceeds, the box 122 comprises means fordefining a bed adapted for the reception of abrasive materials. As usedherein, the term abrasive materials is intended to apply to or describenot only materials that are truly abrasive in nature, but also todescribe or apply to materials that can be utilized for polishing,finishing or otherwise working various articles of manufacture. In theparticular use for which the machine of the present invention isadapted, the abrasive material preferably comprises mine run Garnet ofvarious particle sizes, as is indicated at 124 in Figures 2 and 3. Thebed defining means or box 122, as viewed in longitudinal cross section,is dish-shaped so as to provide arcuate end walls, with the length ofthe box 122 being such as to accommodate longitudinal movement of thebox with respect to the rotor 37. The box 122 is preferably lined with aheavy layer 126 of canvas or the like to prevent undue wear of thematerial from which the box is formed. The box 122 is of a depth toreceive, with clearance, a desired portion of the article of manufactureto be finished by the machine. As shown in Figures 2 and 3, the box 122is adapted for the reception of the entire blade portion of the rotor 37and the side walls of the box extend to or slightly above the uppersurfaces of the upper frame members 12 and 18 to provide for thereception of an adequate amount of abrasive material and to prevent theescape of such material. Intermediate the top and hotton thereof, thebox 122 is provided with outwardly extending side wall portions 128adapted to be rested upon or secured to the tops of the side and endwalls of the sub-frame 116.

The guide means 106 and rollers 110 support the sub frame 116, andthusly the box 122, for reciprocatory movement longitudinally of theframe it To reciprocate the frame 116 and the box 122, a crank rod 13%is pivotally connected at one end to the sub-frame 116 and at its otherend to a crank 132 secured to the shaft of a gear reducer 134 driven byan electric motor 136, the gear reducer 134 and the electric motor 136being shown in back of a housing member 138 for enclosing the crank rod130 and the crank 132 in Figure 1. As shown, the gear reducer 134 andthe electric motor 136 are mounted on the extending portions of thelower longitudinal frame members 14 and are supported by several shortlegs 22.

For operating and controlling the electric motors 50 and 136, a controlpanel 140 is mounted at the drive end of the frame 10. The controlseffected on the motors 50 and 136 will be described in detailhereinafter with respect to the operation of the complete machine. Tostop or cushion the reciprocatory movement of the sub-frame 116 at eachend or limit of its movement, suitable frame members 142 are providedbetween the guide means 106 at each end thereof and spring pressedbutters or shock absorbers 144, which are adapted to engage suitableangle iron reinforcing members 146 secured to the ends of the sub-frame116, are mounted thereon. As is clearly shown in Figure 2, the angleiron 146 adjacent the drive end of the frame also provides a mountingfor the crank arm 13%.

In use and operation of the machine of the present invention, the rotordrive shaft 88 is withdrawn, the split Cir supports 30 are opened and arotor 37 is lowered onto the machine With the end portions of the axle38 thereof being received within the open supports 30 and the bladeportion thereof being received between the supports 30 and extendinginto the box 122 or bed of abrasive material 124. After the rotor hasbeen properly positioned on the machine, the split supports are closedto provide bearings within which the axle of the rotor is journaled forrotation. Thereafter, the shaft 88 is moved inwardly so as to move thesplined head 91 thereof into driving engagement with the internallysplined end portion of the afie 38 of the rotor. As the splined head 99of the shaft 88 is moved into driving engagement with the axle of therotor, the finger portions of the spring biased levers 102 of the clutchmeans are moved into locking engagement in the circumferential groove109 in the flange 96 of the gear 82 of the drive train 48. Beforeengagement of the finger portions of the levers 102 in the groove isaccomplished, it may be necessary to rotate the shaft 88 slightly toeffect alignment between the pin 98 and the one of the holes provided inthe flange 96 so as to establish driving connection between the gear 82and the shaft 83. After the shaft 88 has been coupled to the gear 82,the motor 5% may be started to drive the train 48 and effect rotation ofthe shaft 88 and thusly of the rotor 37. As will be appreciated from thenature of the speed reducer 52 and the speed reducing drive train 48,the blades of the rotor 37 will be moved very slowly through the bed ofabrasive material provided in the box 122. At the same time, the motor136 is started in operation to effect reciprocation of the bed ofmaterial 124 transversely of the axis of the rotor 37.

Due to the fact that the frame is disposed at a slight inclination tothe horizontal, which inclination is preferably in the order of three tofive degrees, and due to the fact that the bed of material isreciprocated, the bed of material will maintain a substantially constantand uniform depth so as to prevent the accumulation of material in anyone portion of the box 122. As the rotor is rotated and the box 122 isreciprocated, the blades of the rotor, which as pointed out are disposedwithin the layer of material, will be finished by the material toeliminate all sharp edges on the blades. Due to the slow movement of theblades, the same will not in any way be damaged by the materials in thebox 122. To insure uniform finishing of the blades, the rotor is firstrotated in one direction for a predetermined interval and is thenrotated in the opposite direction for a predetermined interval. Withrespect to the said one compressor rotor that i have referred tohereinbefore, I have found that finishing of the rotor blades isaccomplished by rotating the rotor in one direction for approximately 15minutes and then rotating the rotor in the opposite direction forapproximately 15 minutes, during which half hour the bed of material iscontinuously reciprocated. In a preferred embodiment of my invention,the control panel located at the drive end of the machine preferablyincludes automatic timing and control means whereby the motors 50 and136 are started in operation by closing a single switch after which themotor 50 is operated first in one direction for a pr determinedinterval, 15 minutes, and then is automatically reversed to effectreverse rotation of the rotor 37 for a like interval, again 15 minutes,whereby reverse rotation of the rotor, as described hereinbefore, isautomatically accomplished. The control means for the machine are alsosuch as to provide for continuous operation of the motor 136 during thetime that the motor 50 is in operation. t the end of the half hour cycledescribed, the control means for the machine may suitably include meansfor automatically dicontinuing operation of the motors 5t) and 136whereby the rotor will be automatically stopped when the finishingoperation thereon has been completed.

In view of the capability of the machine of being automatic inoperation, it will be appreciated that the only necessary employment ofworkers is that required to lower the rotor into the machine, secure thebearing supports 30 about the axle of the rotor, effect engagement ofthe shaft 8.8 with'the axle of the rotor and with the shaft of the gearciated that the machine of the present invention provides forsubstantial economies in man hours expended and increases production toa very great extent. In addition,

' I have found that finishing of the rotor blades as accomplished by themachine of my invention results in a more uniform and accurate finishingof the rotor blades than skilled workmen equipped with'portable electricgrinders have been able to accomplish.

VVrth respect to the relative movement of the rotor blades and the bedof abrasive material, it is to be noted that the blades and the bed ofabrasive material are moved in corresponding directions. That is, eachindividual blade in passing through the bed of material will move fromleft to right, or vice versa, as the rotor is V viewed in Figure 2.Likewise, the bed of material is reciprocated from left toright and viceversa as the same is viewed in Figure 2. Accordingly, relative movementis provided between the blades of the rotor and the bed of 'material,but relative movement takes place along what may be referred to ascorresponding paths of movement. The sub-frame 116 in being reciprocatedlongitudinally of the frame will, at its opposite limits of movement,abut against the'buifers 144 whereby the reciprocatory move merit of thesub-frame is cushioned at each limit.

In view of the foregoing, it will be appreciated that the presentinvention provides substantial advantages over prior methods ofdeburring, or finishing articles of manufacture and provides a'machineof economical manufacture and assembly for accomplishing the aforesaidresults.

While I have described what I regard to be a preferred embodiment of myinvention, it will be appreciated that various changes,'rearrangementsand modifications may be made therein without departing from the scopeof the invention, as defined by the appended claims.

Iclaim:

1. In a machine of the character described, a frame, means on'said framefor supporting an article of manufacture formovement with respect tosaid frame, bed defining means adapted for the reception of abrasivematerial, said bed means being, movably supported by said frame beneathsaid supporting means, said bed means being adapted for the freereception of at least a portion of an article of manufacture supportedby said supporting means whereby the article is positioned at leastpartially in abrasive material in said bed means, means for moving thearticle of manufacture through the abrasive material in said bed means,said bed means being supported for movement in a straight line pathcorresponding to the path of movement of the article of manufacturethrough the abrasive material in said bed means, and meanssimultaneously reciprocating said bed means along said path duringmovement of the article of manufacture through the abrasive material,said bed means being of a length at least equal to the path ofreciprocal movement thereof,

'whereby the article. during its movement is simultaneously subjected tothe reciprocal abrading action of the abrasive material in said bedmeans.

2. In a machine of the character described, a frame,

means on said frame for supporting an article of manu-- facture formovement with respect to said frame, bed defining means adapted for thereceptionof solid unsuspended abrasive material, said means beingmovably supported by said frame beneath said supporting means, said bedmeans being adapted for the free reception of at least a portion of anarticle of manufacture supported by said supporting means whereby, thearticle is positioned at least partially in abrasive material in saidbed means,

means for moving the article of manufacture through the abrasivematerialrin said bed means, said bed means being supported for movement,in a straight line path corre-' tion of said bed means maintaining theabrasive material therein at a'uniform depth;

3. In a machine of the character described, a frame, means onsaid framefor supporting an article of manufacture for movement'with respect tosaid frame, bed defining means adapted for' the reception of solidunsuspended abrasive material, said bed means being movably supported bysaid frame beneath said supporting means, said bed means being adaptedfor the free reception of at least a portion of an article ofmanufacture supported by said supporting means whereby the article ispositioned at least partially in abrasive material in said bed means,said supporting .means supporting the article of manufacture formovement in a generally horizontal path through the abrasive material insaid bed means,

reversible drive means for moving the articleof manufacture inoppositedirections in the said generally horizontal path through-theabrasive material in said bed.

of a length at least equal to'the path of reciprocal movement thereof,whereby the article during movement thereof in one direction or theother is simultaneously subjected to the reciprocal abrading action ofthe abrasive material'in'said bed means, the inclination andreciprocation of said bed means maintaining the abrasive materialtherein at a uniform depth. 7

4. In a machine of the character described, a frame, supports on saidframe for rotatably mounting an article of manufacture on a horizontalaxis, means for slowly rotating an article of manufacture mounted onsaid sup-' ports, a bed adapted for the reception of abrasive materials'upported by said frame beneath and between said supports for thereception of;at least a portion of an article mounted on said supports,said bed being supported for reciprocatory movement in a path inclinedto the horizontal and extending transversely of the axis of an articlemounted on said supports, and means for reciprocating said bed alongsaid path.

5. In a machine of a character described, a frame,

supports on said frame for rotatably mounting an article of manufacture,means for slowly rotating an article of manufacture in both directionswhen the same is mounted on said supports, a bed adapted for thereception of abrasive material supported by said frame beneath andbetween said-supports for the reception of at least a portion of anarticle mounted on said supports, said bed being supported forreciprocatory movement in a path inclined to the horizontal andextending transversely of the axis of an articlemounted on saidsupports, and means for reciprocating said bed along said straight line.

6. A machine for deburring or finishing rotatable articles ofmanufacture, comprising a frame, a pair of split supports mounted onopposite sides of said frame in alignment transversely of said frame forjournaling the axle of a rotatable article, reversible means for slowlyrotating an'article journaled in said supports in opposite directions,and an open top box mounted on said frame at an inclination to thehorizontal beneath and between said supports, said box being of a sizefreely to receive at least a portion of an article journaled in saidsupports and being adapted for the reception of abrasive material toencompass at least a part of an article journaled in said supports.

7. A machine for deburring or finishing rotatable articles formanufacture, comprising a frame, a pair of split supports mounted onopposite sides of said frame in alignment transversely of said frame forjournaling the axle of a rotatable article, reversible means for slowlyrotating an article journaled in said supports in opposite directions,an open top box movably mounted on said frame at an inclination to thehorizontal beneath and between said support, said box being of a sizefreely to receive at least a portion of an article journaled in saidsupports and being adapted for the reception of abrasive material toencompass at least a part of an article journaled in said supports,guide means mounted longitudinally on said frame for defining alongitudinal path of movement for said box inclined slightly to thehorizontal and extending transversely of the axle of an articlejournaled in said supports, and means for reciprocating said box alongsaid path.

8. A machine for deburring or finishing rotatable articles ofmanufacture, comprising a frame, a pair of split supports mounted onopposite sides of said frame in alignment transversely of said frame forjournaling the axle of a rotatable article, reversible means for slowlyrotating an article journaled in said supports in opposite directions,an open top box movably mounted on said frame at an inclination to thehorizontal beneath and between said supports, and an open top boxmovably mounted on said frame beneath and between said supports, saidbox being of a size freely to receive at least a portion of an articlejournaled in said supports and being adapted for the reception ofabrasive material to encompass at least a part of an article journaledin said supports, guide means mounted longitudinally on said frame fordefining a longitudinal path of movement for said box extendingtransversely of the axle of an article journaled in said supports, meansfor reciprocating said box, said frame being so constructed and arrangedas to be inclined to the horizontal in the longitudinal directionthereof whereby said box is reciprocable in a path inclined to thehorizontal, and bulfer means disposed at opposite ends of said frame forcushioning the movement of said box at its limits of movement.

9. A machine for deburring or finishing the blades of compressor rotorsand like articles of manufacture, comprising a frame, a pair of bearingsupports mounted on opposite sides of said frame in alignmenttransversely of said frame, said supports being adapted for rotatablymounting the axle of a rotor, a first electric motor, a shaft driven bysaid first motor, said shaft being adapted for operative connection withthe rotor axle, said frame including longitudinal guides disposedbeneath said supports, a sub-frame mounted in said guides for movementlongitudinally of said frame, a box carried by said subframe, said boxbeing of a size to receive the blades of the rotor with freedom formovement longitudinally of said frame and being adapted for thereception of abrasive material, a second electric motor, and drive meansbetween said second motor and said sub-frame for reciprocating saidsub-frame longitudinally of said frame, said frame being so constructedas to support the rotor substantially horizontally and to support saidsub-frame and said box for movement at an inclination to the horizontal.

10. A machine for deburring and finishing the blades of compressorrotors and like articles of manufacture, comprising a frame, a pair ofbearing supports mounted on opposite sides of said frame in alignmenttransversely of said frame, said supports being adapted for rotatablymounting the axle of a rotor, a reversible electric motor, a shaftdriven by said motor, said shaft being adapted for operative connectionwith the rotor axle, said frame including longitudinal guides disposedbeneath said supports, a sub-frame mounted in said guides for movementlongitudinally of said frame, a box carried by said sub frame, said boxbeing of a size to receive the blades of the rotor with freedom formovement longitudinally of said frame and being adapted for thereception of abrasive material, a second electric motor, and drive meansbetween said second motor and said sub-frame for reciprocating saidsub-frame longitudinally of said frame, said reversible motor beingoperable first in one direction for a predetermined interval and then inthe opposite direction for a like interval, whereby the rotor is rotatedfirst in one direction and then in the opposite direction While the boxof abrasive material is continuously reciprocated transversely of theaxis of the rotor.

11. A machine for deburring or finishing the blades of compressor rotorsand like articles of manufacture, comprising a frame, a pair of bearingsupports mounted on opposite sides of said frame in alignmenttransversely of said frame, said supports being adapted for rotatablymounting the axle of a rotor, a reversible electric motor, speedreducing means driven by said motor, said speed reducing meansterminating in a driven shaft, clutch means for selectively connectingand disconnecting said driven shaft and said speed reducing means, saidshaft being adapted for operative connection with the rotor axle, saidframe including longitudinal guides disposed between said supports, asub-frame mounted in said guides for movement longitudinally of saidframe, a box carried by said sub-frame, said box being of a size toreceive the blades of the rotor with freedom for movement longitudinallyof said frame and being adapted for the reception of abrasive material,a second electric motor, drive means between said second motor and saidsub-frame for reciprocating said sub-frame longitudinally of said frame,said reversible motor being operable first in one direction for apredetermined interval and then in the opposite direction for a likeinterval, whereby the rotor is slowly rotated first in one direction andthen in the opposite direction while the box of abrasive material iscontinuously reciprocated transversely for the axis of the rotor, saidframe being so constructed as to support the rotor substantiallyhorizontally and to support said sub-frame and said box for movement atan inclination to the horizontal.

References Cited in the file of this patent UNITED STATES PATENTS856,072 Lehman June 4, 1907 1,328,603 Stirling Jan. 20, 1920 2,425,640Pruitt et al Aug. 12, 1947 FOREIGN PATENTS 18,107 Norway Mar. 3, 1908

